QPaintEvent Class▲
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Header: QPaintEvent
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qmake: QT += gui
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Inherits: QEvent
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Group: QPaintEvent is part of events
Detailed Description▲
Paint events are sent to widgets that need to update themselves, for instance when part of a widget is exposed because a covering widget was moved.
The event contains a region() that needs to be updated, and a rect() that is the bounding rectangle of that region. Both are provided because many widgets cannot make much use of region(), and rect() can be much faster than region().boundingRect().
Automatic Clipping▲
Painting is clipped to region() during the processing of a paint event. This clipping is performed by Qt's paint system and is independent of any clipping that may be applied to a QPainter used to draw on the paint device.
As a result, the value returned by QPainter::clipRegion() on a newly-constructed QPainter will not reflect the clip region that is used by the paint system.
See Also▲
See also QPainter, QWidget::update(), QWidget::repaint(), QWidget::paintEvent()
Member Function Documentation▲
[explicit] QPaintEvent::QPaintEvent(const QRegion &paintRegion)▲
Constructs a paint event object with the region that needs to be updated. The region is specified by paintRegion.
[explicit] QPaintEvent::QPaintEvent(const QRect &paintRect)▲
Constructs a paint event object with the rectangle that needs to be updated. The region is specified by paintRect.
const QRect &QPaintEvent::rect() const▲
Returns the rectangle that needs to be updated.
See Also▲
See also region(), QPainter::setClipRect()